Vehicle Reverse Gear Speed Control with Post-Disengagement Braking
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Solution Overview
Problem
Existing vehicle reversing systems fail to automatically apply brakes when reversing out of a space, leading to potential collisions due to reliance on driver judgment and lack of continuous distance sensing beyond reverse gear engagement.
Innovation Solution
A method and apparatus that utilize a distance sensor and controller to implement a speed control procedure only while the vehicle is in reverse gear and for a period after disengagement, calculating and applying braking force to prevent collisions by determining the required braking force based on wheel speed and load sensors, ensuring the vehicle stops at a safe distance from objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the distance sensor is activated only when reverse gear is engaged, then the system complexity and energy consumption are reduced, but the vehicle cannot automatically apply brakes when reversing out of a space after gear disengagement
Solution Approach 1:
The system activates the distance sensor and speed control procedure in advance when reverse gear is engaged, preparing the collision prevention system before the actual reversing maneuver begins. This preliminary activation ensures that when the vehicle starts moving backward, the sensor is already monitoring and ready to trigger braking if needed.
Solution Approach 2:
The system dynamically adjusts its operation based on gear engagement state. The distance sensor and speed control procedure are activated when reverse gear is engaged and continue for a predetermined time after disengagement, creating a dynamic transition period that maintains safety during the critical phase of reversing out of a space while reducing complexity when reversing is not needed.
2Ease of operation
If the speed control procedure is implemented only during reverse gear engagement, then the control system operation is simplified, but the vehicle speed cannot be controlled after disengaging reverse gear leading to potential collisions
Solution Approach 1:
The speed control procedure is initiated in advance when reverse gear is engaged and continues for a predetermined time after disengagement. This preliminary and extended operation ensures that speed control is active during the entire critical period when the vehicle might be moving backward, including the transition phase after gear disengagement when collision risk remains high.
Solution Approach 2:
The speed control procedure maintains continuous operation during the entire reversing maneuver by extending its activity for a predetermined time after reverse gear disengagement. This continuity ensures that there is no gap in speed control coverage when the vehicle is still moving backward but the gear has been disengaged, eliminating the collision risk that would exist with discontinuous control.
3Reliability
If the distance sensor remains active continuously, then collision detection coverage is maximized, but energy consumption and system resource usage increase
Solution Approach 1:
The distance sensor is activated in advance when reverse gear is engaged, ensuring it is already monitoring the environment before the vehicle begins reversing. This preliminary activation maximizes detection coverage during the critical maneuver while limiting energy consumption to only when reversing is actually needed, rather than keeping the sensor active continuously during all vehicle operations.
Solution Approach 2:
The distance sensor operates periodically rather than continuously - it is activated when reverse gear is engaged and continues for a predetermined time after disengagement, then deactivates. This periodic operation pattern maximizes collision detection coverage during the relevant reversing phases while significantly reducing energy consumption compared to continuous operation during all vehicle states.
Data Source
AI summary
A method of operating a vehicle wherein the method comprises using a distance sensor to determine the distance between a part of the vehicle and an object, and implementing a speed control procedure if the distance detected by the distance sensor falls below a predetermined value, characterized in that the method is implemented only while the vehicle is in reverse gear and for a period of time immediately following disengagement of the reverse gear.